Ok, these cards were 1 per box. I remember when they came out they weren't very hot. I also remember over the years finding a few in $1 bargain bin boxes. I just checked eBay, COMC, SportLots, and SportsBuy and you are right, that they aren't that easy to find anymore. I have to guess that a number of them are in PCs, and a lot of them are tucked away in the boxes of random 90s inserts that a lot of dealers and collectors have, plus even more are still in packs (though unopened boxes of 1997 Topps Gallery baseball seem to be pretty scarcely for sale too). Best of luck in finishing the set.